Abstract: A process is described for increasing the storage stability of biodiesel by metering a liquid stock solution which comprises 15 to 60% by weight of 2,6-di-tert-butylhydroxytoluene dissolved in biodiesel into the biodiesel to be stabilized up to a concentration of 0.005 to 2% by weight of 2,6-di-tert-butylhydroxytoluene, based on the overall solution of biodiesel.

Abstract: A process is described for increasing the storage stability of biodiesel by metering a liquid stock solution which comprises 15 to 60% by weight of 2,4-di-tert-butylhydroxytoluene dissolved in biodiesel into the biodiesel to be stabilized up to a concentration of 0.005 to 2% by weight of 2,4-di-tert-butylhydroxytoluene, based on the overall solution of biodiesel.

Abstract: The invention relates to a method for carrying out polycondensation reactions, according to which the polycondensation of a monomeric starting material is carried out with external supply of heat in a reactor combination which has at least two stages and is composed of a pre-reactor and a high-viscosity reactor, where the low-molecular-weight elimination products produced are removed by evaporation. In the pre-reactor, the reaction product is concentrated to give a high-viscosity preliminary product. The high-viscosity preliminary product is then fed to the high-viscosity reactor, in which it reacts to completion with simultaneous introduction of thermal and mechanical energy and with a residence time of from 20 s to 60 min to give a polycondensation product.

Abstract: The invention relates to a catheter valve for permanently or discontinuously draining body cavities and discharging urine. The catheter valve consists of a two-component housing having a cylindrical portion and a conical portion. The conical portion houses a shaft that slides along the longitudinal axis of the housing. At a tip of the conical portion is a urine inlet opening that allows urine or other bodily fluids to flow into the catheter. At an opposite end, is a urine outlet opening that allows the fluid to flow out of the catheter. The shaft controls the flow of fluid through the catheter by selectively sealing the urine outlet opening on the catheter. In addition, a locking mechanism is provided to keep the shaft apart from the outlet valve thus allowing free flow of fluid through the catheter.

Abstract: Polymers having recurring succinyl units are obtained by an improved process by reaction of A, an unsaturated C.sub.4 -dicarboxylic acid or a derivative thereof, with B, a nitrogen-donating compound, in a first reaction step to give a reaction mixture comprising at least one low molecular weight reaction product, and subsequent continuous feeding of the reaction mixture into a continuously operated reactor to give the polymer in a second reaction step. In a further embodiment the invention refers to polymers having recurring succinyl units prepared by reaction of an unsaturated C.sub.4 -dicarboxylic acid or a derivative thereof with a nitrogen-donating compound in a first reaction step and subsequent feeding of the reaction mixture, without intermediate isolation, into an optionally continuously operated reactor, with removal of water, and treatment of the reaction mixture at a temperature of 140 to 350.degree. C.

Abstract: 1-alkyl-pyrazole-5-carboxylic acid esters are prepared by reacting the enolate of a 2,4-diketocarboxylic acid ester with an N-alkylhydrazinium salt in the presence of a solvent. This process allows a particularly economic preparation of 1-alkyl-pyrazole-5-carboxylic acid esters in a simple manner and with only little formation of undesirable isomers.

Abstract: Textiles are washed with a liquid washing agent, softened water, and salts of at least one polycarboxylic acid. The polycarboxylic acids are present in part as sodium salt and in part as calcium or magnesium salt.

Abstract: The polymers according to the invention with repeating succinyl units additionally contain iminodisuccinate units.

Abstract: A device for transferring and withdrawing liquids or liquid media from bottles, pouches or similar containers for medical purposes. The device includes a first rotationally-symmetric body including a threaded cam, a first spike with a tip, a first main duct extending to the tip, and a first auxiliary duct extending to the tip. The first auxiliary duct narrows to a capillary-like opening adjacent to the tip. A second rotationally-symmetric body is provided which includes a second spike with a second main duct and a second auxiliary duct. The first body is centrically plugged into the second body wherein the first spike is diametrically disposed with respect to the second spike. The first and second main ducts form a substantially linear, axially extending flow path through the device. The first and second bodies include a recess formed between the first auxiliary duct and the second auxiliary duct.

Abstract: This invention relates to diaminoarylsulfones of the formula ##STR1## wherein R.sub.1, R.sub.2, and R.sub.3 are independently C.sub.1 -C.sub.12 alkyl, that are useful as chain extenders in the preparation of polyurethane elastomers.

Abstract: The light fastness of dyed polyamide fibre materials, in particular of the type used for manufacturing car seat covers, can be substantially improved by treating these materials, before, during or after the dyeing, with copper compounds of the compounds of the formula ##STR1## wherein R=H, OH, alkyl or cycloalkyl. The compounds (I) are distinguished by low self-colour and good stability to acid conditions.

Abstract: The invention relates to a process for the preparation of optionally p-chlorine-substituted 2,6-diaminotoluene, which is characterized in that 3,4-dichlorotoluene is dinitrated in the presence of an inert, water-immiscible, organic solvent and/or diluent at temperatures of -10.degree. to +100.degree. C. and is subsequently reduced, optionally after intermediate isolation of the dinitro compound, in the presence of an inert organic solvent and/or diluent and/or of water, with partial or complete splitting-off of the chlorine atoms, to give the diamino compound.2,6-Diaminotoluenes are valuable intermediates for the preparation of diisocyanates and polyurethanes; the 2,6-diaminotoluene is furthermore used for the preparation of dyestuffs and antioxidants.

Abstract: A coupling for connecting the ends of medical apparatus tubes. The coupling has male and female conical mating elements on first and second end pieces. Each end piece is adapted to receive the end of a tube. The end pieces are locked together to prevent unintentional separation. Locking is achieved by at least one finger extending from one end piece to the other end piece. The finger, in addition to its locking function, resists tension when tensile stress is applied to a coupled tube.

Abstract: The invention relates to a process for the preparation of 4-nitrodiphenylamines by the reaction of halogenonitrobenzenes with primary aromatic amines in the presence of copper or a copper compound, a neutralizing agent and a cyclic diaza compound.